From an amazing book that just came out:
For Cambodians, your true love — the one who holds you tight on cold nights — is a "phuey sac." Literally a "flesh blanket." This sounds like an accessory from Hannibal Lecter's line of horrific home furnishings, something to curl up under and enjoy a nice Chianti, but it's considered a powerful term of endearment by Cambodians. Everyone wants to find a phuey sac to keep them warm at night.Cambodia may be a poor country, but it's rich in odd phrases.